Turbulence is natural. Turbulence is caused by the Jet Stream. The jet stream is caused by the earth's rotation. It zips across the U.S. up at 30,000 to 40,000 feet. If you fly in it, it is smooth. Also, if you are some distance horizontally or vertically from it, it is smooth. But when you are in its vicinity, friction between fast-moving jet stream sort of makes the nearby slow-moving air into ball bearings to roll across the sky on. Then, when you are flying in those rolling ball bearings of air, you get turbulence. When you go into one rolling up, the airplane goes up; then you come out the back side which is rolling down, and the plane goes down.
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